Expansible chuck



'(No Model.)

J. 0. SMITH. EXPANSIBLE CHUCK.

Patented 001;. 13, 1896.

INVENTUR 3 UNITED STATES PATENT OFFICE.

JAMES 0. SMITH, OF NEIVARK, NEW JERSEY. I

EXPANSIBLE CHUCK.

SPECIFICATION forming part of Letters Patent No. 569,245, dated October13, 1896.

Application filed June 6, 1894.

To ail whom, it may concern:-

Be it known that I, JAMES 0. SMITH, acitizen of the United States,residing at Newark, in the county of Essex and State of New J ersey,have invented certain new and useful Improvements in Expansible Chucks;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters of reference marked thereonwhich form a part of this specification.

The object of this invention is to provide a simple, durable, andeffective chuck for holdin g a hollow tube or core to a mandrel or shaftwhile a continuous web of paper or other material is being wound upon orunwound from such tube or core, and capable of being expanded andcontracted at pleasure, so as to snugly fit such hollow tube and preventthe latter from turning thereon, and to be readily released therefromwhen desired.

The invention consists in the improved chuck, and in the combination andarrangement of the parts thereof an d connected therewith, as herein setforth, and finally pointed out in the claim.

Referring to the accompanying drawings, in which similar letters ofreference indicate corresponding parts in each of the figures where theyoccur, Figure 1 represents a hollow tube or core with a web of paperthereon and mounted upon my improved chuck. Fig. 2 represents, partly insection and partly in elevation, a broken-off portion of the same,en-

larged. Fig. 3 is a transverse section through said tube and the shaftupon which the chuck is mounted and showing the said chuck in endelevation. Fig. at is an inverted plan of one of the segments orsections of a sleeve carried by said plug, and Fig. 5 is a plan of theplug aforesaid.

In said drawings, A represents the shaft upon which my improved chuck ismounted.

13 represents a hollow tube or core upon which the web of paper C isrolled.

In carrying out my invention I construct a central plug a, bored to fitthe shaft or mandrel, and provided on its outer surface with Serial No,613,624. (No model.)

raised ribs a, three in number in the present instance, undercut at thesides, each being provided with a central longitudinal groove Z) in theouter surface thereof, said plug being smaller in circumference at theinner extremity than at the outer extremity and tapering uniformly.Mounted upon said plug is an adjustable sleeve composed of three sections 0, each section being provided at its opposite sides with a lip(Z, adapted to engage with the undercut edges of said ribs to hold theparts together, thus avoiding the necessity of bands, clasps, or ringsupon the outside for such purpose. Said sections are also provided witha central tongue 6 to engage in said groove and serve as a guide to themovements of said sections and also as a stop to limit said movements,it being understood that the sleeve has a longitudinal movement uponsaid plug, whereby the sleeve is made to contract and expand as it ismoved back and forth upon the plug, as will be understood. Said sleeveis provided on its outer surface with longitudinal ribs f, to make itadhere more firmly to the hollow tube or core, and is also provided atthe meeting edges of the sections with tongues or flanges g on one sideand corresponding recesses at the other, which engage and serve asguides to the sections and to hold them into alinement with one anotheras they open and close in expanding and contracting when movedlongitudinally on said core. In order that the circumference of thesleeve shall be uniform from end to end, the said sections must beenough thicker at the inner ends than at the outer ends to compensatefor the taper of the core, as will be manifest, it being regarded aspreferable to have the circumference of the sleeve uniform from end toend, rather than to have ittapering, so as to make it adhere moretenaciously to the hollow tube, as will be understood. The movement ofsaid sections inwardly is limited by a set-screw h, inserted at or nearthe inner ends of the grooves, and outwardly by a shoulder or collar 2',against which the tongues e engage as the sleeve is moved longitudinallyupon the plug.

When it is desired to remove the sleeve from the plug, the screws 7Lneed only to be backed out, as will be manifest.

It will be observed that at the base of the ribs a, at each side, areformed grooves C6, the object of which is to provide room for asufficient body of sand to facilitate the opera tion of casting, as willbe understood.

In order to secure the chuck to the shaft, I have provided said plug,near the outer extremity, with a set-screw k for the purpose; but anyordinary key or fastening may be substituted therefor, if desired.

From the foregoing it will be seen that the chuck is capable of beingadjusted to a hol- 10W tube or roll for receiving a web of paper orother material very easily, quickly, and firmly, and of being releasedtherefrom with equal facility. It will also be observed that thenecessity and expense of screwing the plug upon the shaft and securingthe parts by a cap and nut, as heretofore, are avoided, and that it isrenderedcapable of being adjusted to any part of the shaft and to shaftsof varying sizes with the greatest facility and ease.

Having thus described my invention, what I claim as new, and wish tosecure by Letters Patent, is

In an eXpansible chuck having a plug mounted thereon, ribs with undercutedges and having longitudinal grooves therein,a sectional sleeve mountedon said plug, each of said sections having lips adapted to engage saidundercut edges and a tongue adapted to enter said groove, flanges oneach of said sections, said sections being provided with recessesintermediate of their length and adapted to have said flanges entertherein,.a collar on one end of said plug and screws'fitting in theouter end of said grooves, all of said parts being combinedsubstantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this2d day of June, 1894:.

J AMES 0. SMITH.

YVitnesses:

OLIVER DRAKE, LOUISA BRoWNE.

